What was found
AFTER ARRIVAL, AIRCRAFT POWERED BY BATTERY FOR 30 MIN. - FANS, LIGHTS, CARGO DOOR, ECT. WHEN POWERED UP, NOTED 18 V, TURNED ON BATT INTERLOCK OVERRIDE FOR A FEW MINUTES WITH GPU ON- BATTERY TEMP 120 DEGREES, FOLLOWED COM PROCEDURE AND LOWERED BATTERIES. BATTERY COOLED AND CONTINUED, 10 MINUTES.